FeatureFlags: Revert managing feature flags outside of settings.Cfg (#44382)

* Revert "FeatureToggles: register all enterprise feature toggles (#44336)"

This reverts commit f53b3fb007.

* Revert "FeatureFlags: manage feature flags outside of settings.Cfg (#43692)"

This reverts commit f94c0decbd.

pkg/services/featuremgmt/settings.go

@@ -1,34 +0,0 @@
-package featuremgmt
-
-import (
-	"io/ioutil"
-
-	"gopkg.in/yaml.v2"
-)
-
-type configBody struct {
-	// define variables that can be used in expressions
-	Vars map[string]interface{} `yaml:"vars"`
-
-	// Define and override feature flag properties
-	Flags []FeatureFlag `yaml:"flags"`
-
-	// keep track of where the fie was loaded from
-	filename string
-}
-
-// will read a single configfile
-func readConfigFile(filename string) (*configBody, error) {
-	cfg := &configBody{}
-
-	// Can ignore gosec G304 because the file path is forced within config subfolder
-	//nolint:gosec
-	yamlFile, err := ioutil.ReadFile(filename)
-	if err != nil {
-		return cfg, err
-	}
-
-	err = yaml.Unmarshal(yamlFile, cfg)
-	cfg.filename = filename
-	return cfg, err
-}